hello, 

there is in IPB the option :

 

Quote

 

 Allow filtering by this group?

 
You may wish to turn this off if you do not wish the existence of this group to be known in areas which allow filtering by different groups such as the online users list. This is particularly useful for groups which are only used as secondary groups.  

 

 

 

it is possible to allow filters in all groups, so that each member can only see the people in his group. make invisible members who are not part of his group

this will make it easier to find and see only members sharing the same interests for example

or even make his profile accessible only to members of his group

 

14 minutes ago, annadaa said:

it is possible to allow filters in all groups, so that each member can only see the people in his group. make invisible members who are not part of his group

No.